Kinetics of Propene Polymerization with Ansa-Zircanocenc Catalysts: Dependence of Catalyst Activity and Polymer Molecular Weight on Propene Concentration

摘要

The structural details of isotactic polypropenes (iPP) produced with Brintzinger-type chiral ansa zirconocenes are strongly dependent on [propone], because of chain end epimerization becoming significant at the lower monomer concentrations J>2 We have recently proposed a new kinetic model for chain propagation perturbed by epimerization which fits the observed changes in molecular weights with [propene] in the case of the C2-symmetrie, moderately" isospecific catalyst /-af-[ethylenebis(l-indeny)]ZrCl2/MAO (lr/MAO).2